Lock nut



J.H N

LLLLL UT taining nuts.

' Patented Oct. 30, 1928.

UNITED STATES OFFICE.

JAMES HOYT BROWN, OF BOSTON, MASSACEUSETTS, ASSIGNOR T0 BROWN LOOK NUT COMPANY, A CORPORATION OIE DELAWARE.

Application filed May 2, 1925. Serial No. 27,451.

This invention relates to look or self-re- The object of the invention is to devise a construction of a nut made from one pieoe of metal which in itself is efficient and positive in action, simple 1Il form and inexpensive to make, capable of being cosy and quickly handled and applied, removable' when desired without injury to'the thread in the nut or injury to the thread on the bolt.

WVith the foregoing and other objeots in view'which will appear as the description proceeds, the invention resides in the featurcs of construction and in the combmatwn and arrangement of parts hereinafter desoribed and claimed, it being understood that changes in the features, combination and arrangement can be made within the scope of and without departing from the spirit of the invention. In the aocompanying drawing forming part of the specification, Fig. 1 is a side elevation partly in section, With a bolt and my improved look nut as it appears if the nut B is a loose fit on the bolt 1 before it is sorewecl entirely home; Fig. 2 is a view similar to Fig. 1 with my improved look nut screwed home;

Fig. 3 is a plan view of the construction shown in Figs. 1 and 2;

Fig. 4 is a side elevation of my improved look or selfretaining nut;

Fig. 5 is a similar view to Fig. 3, but is shown on a hexagon nut;

Figure 6 is a plan view showing a modification in which the lip or thread engaging portion of the ring liesin the plane of the rm ike reference numerals indicate oorres; ponding parts in the diflerent figures of the drawing.

Referring to Figs. 1, 2 and 3, the reference numeral 1 indioates a bolt. B represents the body portion of my improved look nutwhioh is threaded to 'receive the bolt 1. C represents the portion which has been formed by sawing or milling through from the ont side of and into the body of the nut. The top portion 0, is slightly bent up from the body B,.as shown in Fig. 4. D shows a U-shaped bond made from the free end of the portion 0 and extends slightly over the bore of the threaded body portion.

of the nut as shown in Fig. 4 as indioated by G. The extreme end of the bond U is made wedge shape as shown in Figs. 1, 2 and 4:,

a trifie further clown.

for the purpose of contact with and intothe thread of the bolt 1 as shown in Figs. 1 and 2, the wedge shape end of the portion C is the only portion of C that touches or comes in contact With the bolt l, by reason of the portion 0 having a nonthreaded opening through which the bolt will pass as the improved look nut is sorewed onto the bolt 1, as indicated in Figs. 3 and 5 by the bolt outside oircular line E in the portion C. When the bolt 1 has been sorewed through the body of the nut and passes through the opening E, in the portion C and reaches the wedge shape end of the U- shaped bond, the wedge end of the bond U will enter the thread of the bolt, at the starting point of the thread and will ride in betweenthe threacls on the bolt as shown in Figs. 1 and 2 and will immediately spring the portion 0 clown toward the body portion of the nut, as indioated by the dotted lino F in Fig. 4. The body of the nut B, will be slightly tilted as it appears in Fig. 1, if the nut is a loose fit on the bolt. The tilt will only ocour when the nut B is a loose fit on the bolt 1 is caused by the spring tension of the portionC, the contact wedge shaped end of the U-bend gets the pressure downward from the under side of the thread just above the wedge G, as the nut B is screwed onto the bolt 1. The arrangement as desoribed and shown in the drawing is the looking or retaining ineans of my invention and will positively retain said nut at any point on said bolt 1, and after the wedge shape end G has entered between the lirst and second threads on the bolt 1, the nut can not be shaken, jarred or vibrated' looso, whether in or out of service, and when it is screwed home as shown in Fig. 2, the locking mcans is greater becauso When the nut is sorewed home on the bolt, as shown in Fig. 2 of the drawing, the nut is then against a fiat surface, and the portion C is sprung This movement also forces the wedge shaped end G into the root of the thread on the bolt a little tighter, which causes a greater friction on the bolt.

In the modification shown in Figure 6, the thread engagin lip indicated at 0, and corresponding to t e thread-engaging portion G in Figure 4, lies in the plane of the ring 0, and is preferzibly formed by swaging away the thread of the nut except at the portion opposite the point at which said ring is fixed in any suitable manner to the nut body B, The'remaining features of the modification are as described in connection with the other form of the invention. I represents the outside circumference 'of the thread and H the inside circnmference. The lip is preferably cres ent shape as indicated by the dotted limes so as to facilitate its engagement -'with the thread of the bolt.

The slot ont into the nut to form the portion 0 as it appears in Figure 4 may be made to the depth as indicatedby the dotted line M M in Fig. 5 which will permit threads to be out through the entire body of the nut opposite the bend U and will allow the tension of the. Portion C to have the same movement, but will increase the tension on the boit. The tension may be regulated by the shape the portion 0 is made and the depth V to which the parts are separated.

It will be understood that the portion C of my impr0ved look-mat may be bent away from or towardflthe body of the nut; in either case it will cause the required tension for retaining the nut on the threaded boit.

If the portion C is bent away from the body of the nut, then, as the nut is threaded on a. boit, the U bend,.,when it engages in the thread of the boit, causes the portion 0 to spring toward the body of the nut and this tension positively holds the nnt in place on the bolt. If, however, the portion 0 is bent toyvard the body of the nut theng-when the U bend engags in the thread of .the boit, the portion C will spring awayfrom the body of the nut and by this tension it will likewise.hold the nut in place on the bolt.

M improved look-nut is contructed from regu ar stock nuts and eliminates look washars, look nuts, jaxn nuts, grip nuts, and the like. When the improved nnt is used there will also be a saving in boit metai because bolts czin be made shorter on acoount of eliminating extra length t0 accommodate grip or jam rmts.

My improved locknut will not harm the threads oi either boit or nut and it can be used as often as any ordinary nut. I do not daim br0adly the non-threaded opening through the portion C.

(Vhat I claim as new is:

1. A .lock-ni1t comprising a threaded nutbody slotted near one end to provide a resiiientiy connected With one side of sai nut-body, said ring loosely surrounding approximately three quarters of the circumnut-body, said ring loosely surrounding approximately three qnarteis of the circumference of a boit, said ring having, at the side opposite that at which it is joined to the nut-body, a lip, said lip exerting a resilient pressure on one side of the thread of the bolt, said lip lying in a diferent plane from that of the ring.

3. A look-nui: comprising a threaded nutbody slotted near one end to provide a rin resiiientiy connected with one side of sai nutbody, said ring loosely surrounding approximateiy three quarters of the cireumference of a boit, said ring having, at the side opposite that at which it is joined to a the nut-body, a lip, said lip exerting a resilient pressure on one side of the thread of the boit, said ring inoreasing in thickness to ward the side at which it is oined to the nutbody.

4. A nut having a ring resiliently connected therewith and adapted loosely t0 surround :1 boit when.the boit extends through said nut, said ring having at its free end a lip adapted to engage a thread of the boit and to exert tension in a direction parallel with the axis et the boit and thus tending when in action to throw the nut one way and the boit the other way.

5, The combination in a nut of a nut body, a ring resiliently attaohed thereto and adapted loosely to surr0und a boit when the boit is positioned through the nut, said ring having a portion adapted to engage a thread of the-boit and to exert tension in a direction parallei with the boit axis thereby to bind the nut on the boit upon relative movement therebetween.

In testimony whereof I affix my signature.

JAMES HOYT BROWN. 

